Attachment_6_-_CAFB_Electrical_Standards.pdf

Last Edited by: Diep Nguyen

Base Electrical Engineer

Print Date: March 13, 2012

Cannon Air Force Base Page 1

U.S. AIR FORCE

Electrical Standards Cannon AFB, New Mexico

2 7 S O C E S / C E P

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Attachment 6

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Table of Contents

GENERAL REQUIREMENTS 5

UTILITIES 6

GENERAL DESCRIPTION 6

SPECIFIC REQUIREMENTS 6

EXTERIOR LIGHTING 6

INTENT 6

APPLICABILITY 6

EXCEPTIONS 6

PROHIBITED LIGHTING 7

SPECIFIC REQUIREMENTS 7

EXTERIOR ELECTRICAL WORK 9

INTERIOR ILLUMINATION LEVELS 11

INTERIOR ELECTRICAL WORK 11

LIGHTNING PROTECTION 12

CONTRACTING PACKAGE 12

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Electrical Standards General Requirements

1. Site and project specific electrical security requirements will be developed with the advice and assistance of the 27SOCES/CEP flight.

2. As a minimum, design in accordance with the latest issue of the National Electrical Code (NEC), Design Safety Requirements for Electrical Systems

(29 CFR 1910), Section 340 of the Energy

Conservation and Production Act (42 U.S.C. 6834), and as specified herein or in the requirements document. Incorporate any additional and/or more stringent requirements specified herein or in the requirements document.

3. For large electrical designs, perform electrical load analysis, coordination study, voltage drop analysis, conductor sizing and other design calculations as required by the 27 SOCES PM.

4. Perform a fault current analysis starting with the available short circuit megavolt ampere (MVA) at the point of service to the facility transformers and computing the minimum rating for all fuses, circuit breakers, panel boards, and bussing.

5. Ensure that the primary feeder has adequate spare capacity to supply the added load imposed by the proposed project. Submit this data to the 27 SOCES PM in SKM Power Tools for

Windows or other electronic format as approved by the 27 SOCES PM. Submit final approved copies of this data to Central

Engineering Files (CEF).

6. Cable pulling calculations are required for any exterior underground cable pulls over 500 FT.

in length. Maximum conductor size is 500 MCM for all medium and low voltage.

7. Primary voltage is 12470/7200 V, 3 phases.

8. Secondary voltage is 277/480V or 120V/208V.

9. The Cannon Air Force Base (CAFB) Fire

Department and Safety Office shall be invited to participate in all design reviews that include fire protection systems.

10. The CAFB High-Voltage System Engineer shall be invited to participate in all design reviews that include the high voltage distribution system.

The CAFB High-Voltage System Engineer shall be required to concur with all designs that affect the high-voltage distribution system.

Concurrence shall be provided by signature on drawings and specifications prior to approval and construction.

11. All electrical equipment shall be UL listed and shall conform to Factory Mutual (FM) Standards as applicable. Exceptions shall be approved by the PM.

12. All electrical designs shall provide an updated panel schedule (if affected) with the design package. The latest panel board schedule can be obtained from CE and should be compared with the panel schedule in the field (if available). If there are differences of a significant nature, or no field schedule is available, inform the

Contracting Officer’s Technical Representative, 27 SOCES PM or the construction monitor for resolution. Once this work has been completed, the contractor or shops performing the work shall ensure this updated panel schedule is installed in/on the panel board and the panel schedule is returned to CE.

13. In matters of facility design, construction, operations and maintenance, the safety and health of employees and the public and mitigation of any adverse impacts on the environment take precedence over other aspects such as function, cost or expediency.

ES&H facility performance objectives shall comply with applicable provisions of the latest

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Print Date: March 13, 2012 edition of the 27 SOCES/CAFB Environmental

Resources Document (ERD).

14. Minimum utility line burial depths shall be 36 inches. Note: All electric utilities shall be in conduit, encased in concrete and shall have metallic strip caution tape installed per NEC.

Concrete over primary ducts shall also have red markings.

Utilities

General Description

Utilities are a functional and unavoidable element that should be blended into other site features.

These elements can create visual clutter, therefore every effort should be made to minimize the negative impact to increase focus on more aesthetic areas in the landscape. Relocating significant utilities lines and equipment away from high visibility areas will have the greatest impact in improving the overall character of the installation.

Specific Requirements

New overhead utility lines and building feeds are prohibited. Existing overhead lines shall be relocated underground at the earliest opportunity.

1. Exposed cables, conduit and wires are prohibited. Exceptions shall be submitted to and approved by 27th SOCES.

2. Utility structures shall be incorporated with building designs to avoid free standing elements

3. Pad mounted equipment shall be located in less visible areas and screened.

4. Irrigation back flow preventers may use solar powered housing.

5. Utilities shall be collocated prior to entering the service side of the buildings.

6. Electrical transmission poles shall be metal.

7. Underground electrical distribution vaults are prohibited.

Exterior Lighting

Intent

To set forth lighting standards for outdoor uses that serve to create a safe and comfortable nighttime environment, while protecting the public’s ability to view the night sky. These lighting standards are designed to ensure personal safety and prevent motor vehicle and pedestrian conflicts by reducing the negative effects of glare, light pollution, and light trespass.

Applicability

The outdoor lighting regulations contained herein shall apply to all exterior lighting and to interior lighting to the extent that it impacts the outdoor environment, including lighted signage.

Exceptions

1. Lighting required by the FAA for the air traffic control and warning purposes.

2. Airfield operations, aprons, and adjacent areas that use lighting requirements from UFC 3-535-

01 Design Standards for Visual Air Navigation

Facilities.

3. Requirements stated in UFC 3-530-01 Design:

Interior and Exterior Lighting and Controls that conflict or are more stringent than those listed in this document.

4. Lighting required temporarily for emergency purposes or repairs.

5. Temporary use of low-wattage lighting for public festivals or events, and the observance of holidays provided they do not create disability glare.

6. Single-family residential lighting, except as prohibited in this appendix.

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Prohibited Lighting

1. Low pressure sodium, Low pressure sodium and

Mercury vapor lamping.

2. Blinking, flashing, or changing intensity lights including those proposed for signage.

3. Lighting that could be confused with traffic control devices.

4. Lighting of a type, style or intensity determined to interfere with the safe flow of traffic.

5. Strobe lights, searchlights, beacons, and laser light or similar upward or outward oriented lighting.

6. Lighting creating a public hazard, including lighting that creates disability glare, particularity where such disability glare has a detrimental effect on motor vehicle traffic.

7. Light mounted on poles for the purpose of illuminating the building façade.

8. High-intensity floodlighting except as approved for sport facility lighting.

9. Wall pack light fixtures that are not classified as full cutoff.

Specific Requirements

1. Light levels for streetscapes, parking and pedestrian areas shall be no more than 5 foot candles (fc) and not less than 0.2 fc.

2. Timer/Photocell combination controls that turn on at dusk and turn off at sunrise or selected times shall be used for all exterior fixtures including parking lots.

3. All exterior lights shall be full cut-off fixtures.

4. All service to exterior lighting shall be underground or solar powered.

5. All pole mounted fixtures shall be shoebox type, factory finished medium bronze, tapered round pole, with one or two arms depending on the light level needed.

6. Primary, secondary, tertiary and service roadways shall all use the same luminaries, poles and mounting heights.

7. Roadway and parking lights shall be mounted at a height of 30’-0” Maximum.

8. Poles mounted along roads shall be spaced evenly and alternate sides.

9. Lighting shall be provided on all corners of intersections.

10. Pole placement shall be coordinated with the layout of parking islands.

11. Pole mounted fixtures in parking lots or unprotected areas of traffic shall be mounted on a 2’-6” concrete pier.

12. Pole mounted walkway lighting shall be

12’-0” high.

13. Bollard lighting is prohibited.

14. Pedestrian scale lighting shall be provided along sidewalks and recreational trails that are not directly adjacent to lighted roadways.

15. Wall mounted light fixtures are encouraged for wall washing architectural features and lighting plazas, enhanced paving and stairs. Surface mounted fixtures may be installed on burnished or smooth block.

16. Accent lights should be used sparingly to create hierarchy of architectural and landscape features.

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17. Traffic signals shall match the style and form of those on D.L. Ingram Boulevard

18. Outdoor lighting shall meet the following requirements:

a. Light fixtures, except as otherwise permitted in this appendix, are required to be full cutoff as defined by the IESNA.

b. Full cutoff light fixtures result in a light distribution pattern where no light is permitted at or above a horizontal plane at the bottom of the fixture.

19. All outdoor light fixtures should utilize one of the following lamp types:

a) metal halide

b) Electrode-less induction

c) Compact fluorescent

d) incandescent (including tungsten-halogen)

e) High pressure sodium

f) Light Emitting Diodes (LED) in compliance with ETL 10-2: Light-Emitting Diode (LED)

Fixture Design and Installation Criteria for

Interior and Exterior Lighting Applications, 18 March 2010 or most current version.

g) Alternative lamp types are permitted provided they are approved by CAFB and can be demonstrated to be more effective for the proposed use, based on IESNA recommendations.

20. Full cutoff fixtures may not be tilted or aimed in a manner that results in light distribution above the horizontal plane.

21. Light fixtures associated with canopies, including but not limited to fuel islands, seasonal outdoor areas, and bank drive thrus, shall be full cutoff or mounted so that the bottom of the lens is recessed or flush with the bottom surface of the canopy.

22. All light emitted from canopies shall be substantially confined to the ground plane directly beneath the perimeter of the canopy.

23. No lighting of any kind shall be allowed on the top or sides of a canopy, unless approved by

CAFB.

24. Spacing between fixtures and height of canopies shall be designed so that the luminance level under the canopy does not exceed 20 foot-candles.

25. All light fixtures within 15’-0” of Cannon Family

Housing or base boundaries adjacent to residential areas shall be classified as IES Type II or Type III. Fixtures shall be fitted with “house side shield” reflectors on the sides facing the residential areas.

26. Luminance levels shall not exceed 10 foot-candles measured as initial horizontal luminance unless stated otherwise in this appendix. The initial luminance level is measure following 100 hours of operation.

27. The luminance levels at building entrances and windows may exceed 10 foot-candles by 100% up to a distance 5’-0” from the building to accommodate light spillage from within the building and light from signage.

28. A maximum of two light fixtures per pole is recommended for parking lots; except for perimeter lighting, which should be limited to one fixture per pole.

29. Perimeter lighting shall be classified by IES and

Type II or Type III.

30. The use of semi-cutoff or cutoff (as opposed to full cutoff) fixtures shall be permitted to illuminate areas other than parking lots provided the pole or mounting point is no more that 10’-

0” in height and the maximum lumen output does not exceed 1800 lumens per lamp.

31. When semi-cutoff or cutoff fixtures area used, a maximum of one lamp per fixture and two fixtures per pole or mounting point is required.

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32. Fixtures located on pole or at mounting points more than 10’-0” in height or that exceeds 1800 lumens per lamp shall be full cutoff fixtures. All lighting, except those required for security as listed below, shall be reduced to security levels within one hour after the end of business until one hour prior to the commencement of business.

33. Security lighting at entrances, stairways, loading docks, and parking lots is permitted.

34. Motion sensors for security lighting are strongly encouraged and shall not be located so that it is triggered by normal pedestrian and vehicular traffic.

35. All signage lighting shall be turned off within one hour of the end of business and remain off until one hour prior to commencement of business.

36. All exterior recreational area lighting used for the purpose of illuminating the playing area shall be turned off following the conclusion of the final event of the night. The remainder of the lighting around the field shall be turned off within one hour after the event and remain off until one hour prior to the next event.

37. Lighting in residential areas and open spaces should be limited to 2400 lumens per fixture unless shielded.

38. Luminance for a building façade to enhance architectural features may be permitted provided it is approved by CAFB. Building facades may be illuminated to a maximum of 20 foot-candles as measured on the façade.

39. Lights mounted on poles for the purpose of lighting the building façade are not permitted.

40. Illumination of a flag on a flagpole is permitted provided a narrow spread 39-watt PAR metal halide or 50-watt PAR-halogen lamp or equivalent lamp with narrow spear is used and aimed to only illuminate the top of the flagpole.

41. Luminance of a sign face by a ground mounted fixture shall not exceed 50 foot-candles. It is recommended that lighter lettering on a dark background be used to maximize visibility.

42. Signage that is internally lit shall be limited to a maximum of 1,000W.

43. No sign shall be illuminated with fixtures that allow for the unshielded upward transmission of light.

44. CAFB will review lighting plans for compliance with the requirements of this appendix. All drawings sets shall include:

a. A narrative describing how the design of the proposed lighting, including the fixture types, mounting heights, lamp types, locations, luminance levels, controls, and sign lighting complies with the intent of the context and regulation contained in this document.

b. Identification and description of all light fixture locations including whether they are pole, ground or building-mounted. The location of the light fixtures shall also be shown on the Landscape Plan.

c. Description of light-level-reduction controls for each fixture or grouping of fixtures, and resulting after-hours light levels.

d. Maximum outdoor luminance levels shall include signage lighting and light spillage from within a building. The impact of this luminance shall be described in the lighting plan narrative.

Exterior Electrical Work

1. Medium Voltage Cable: Medium voltage cables shall be copper, 15KV, XLP 133% insulation, type MV90, concentric neutral with PVC jacket

(#2 minimum size). Cable installation plans shall not be included in the specifications.

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2. Medium Voltage cable terminations and splices shall be of the preformed type only, tape type are not acceptable.

3. All underground distribution switchgear should be of the 4 way Cooper VFI series (or other maker equivalent meaning that fusing is not the sole sensing mechanism. It should also sense and open ground fault conditions).

4. All MV connections are to be made using 600 amp deadbreak, 200 amp loadbreak connections. No live equipment is authorized for use.

5. Lighting Poles shall be 30’ anodized bronze aluminum with shoe box fixture to match existing base standard. Troop walk and sidewalk lighting shall be accomplished using

High Pressure Sodium (HPS) luminaries not to exceed 70 watts. Bollard fixtures shall not be used unless specifically so stated in project definition.

6. Area lighting (where required) shall be accomplished using HPS luminaries not to exceed 150 watt on 30’ (typically) anodized bronze tubular steel poles. High mast lighting shall be considered for large square parking lots.

7. Transformers: New building service transformer shall be pad mounted, oil filled, air cooled, served by an underground concrete encased duct bank.

8. Transformer fusing shall be current limiting fuses combined with load sensing Bay-O-Net fuses.

9. Transformers shall be provided with a no-load tap changer with two 2-1/2% above and 2-1/2% below rated voltage taps. The high-voltage compartment shall be a dead-front construction with load break switching.

10. All transformers shall be feed-through unless otherwise approved. Switches shall be mounted inside the transformer tank with switch operating handles located in the high voltage compartment and equipped with metal loops for hook stick operation. Adjacent to switches, nameplates shall identify switch operating handles and “ON” and “OFF” positions.

11. Southeast District transformers should have dual primary voltage of 12,470V and 4,160V unless otherwise requested.

12. All pad-mounted transformers shall be screened from view and provide working space in according with National Electric Code. Screen type shall adhere to the Cannon AFB

Architectural Compatibility Guide. All transformers shall have main breakers to buildings.

13. Manholes: All electrical concrete manholes, hand holes and pull boxes shall be of the precast type and shall be designed for adequate drainage and waterproofing. The use of load junctions and separable splices shall not be permitted.

Terminations shall be made above ground.

14. Aerial to Underground Medium Voltage

Connections shall be made in accordance with

Air Force Joint Manual (AFJMAN) 32-1080.

Pole risers shall be intermediate metal conduit in conformance with National Electrical Code.

15. Metering: All electrical shall be metered utilizing

Schneider Electric/Square D ION 8600 meters.

All meters shall contain a separate indicator for measuring maximum kilowatt demand and pulse initiator. Pulse I initiators shall be solid state and factory installed. Meters shall be installed with shorting blocks or test switches to allow removal of the meter. Meters shall be compatible and able to communicate with the

Base EMCS system.

16. All primary service shall be in PVC ducts using type cable with concentric neutral compatible with base system. All duct banks containing voltage over 600 volts shall be concrete encased.

17. Primary distribution conduits (along main run between underground structures) should be 5 inches. Primary distribution conduits (on

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Cannon Air Force Base Page 11 laterals) and secondary distribution conduits should be 4 inches.

Interior Illumination Levels

Illumination shall be based and designed in accordance with the requirements of Unified

Facilities Criteria UFC 3-530-01, ASHRAE

90.1/International Energy Conservation code (IECC), and Illuminating Engineering Society of North

America (IESNA). The recommended levels of illumination in foot candles are as follow:

Office (ambient lighting) 30 fc horizontal

Office (task lighting) 50 fc horizontal

Storage Areas 10 fc vertical

Conference Rooms (ambient) 30 fc horizontal

Conference Rooms (task) 50 fc horizontal

Utility and Janitor Closets 30 fc horizontal

Communications Rooms 30 fc horizontal

Restrooms (ambient) 5 fc horizontal

Restrooms (at mirrors) 30 fc horizontal

Interior Electrical Work

1. Cables: Conductors in cables shall be of copper only. Conductors #12 AWG and larger shall be stranded. Minimum acceptable size for power cables shall be #12 AWG., 75 degree.

2. Interior Wiring Conduit: No rigid nonmetallic conduit or electrical nonmetallic tubing shall be allowed. If conduit runs penetrate firewalls, conduit shall be used a minimum of three feet on each side. Metal-clad (type MC) cable is not acceptable and shall be so stated in the specifications under “wiring methods”.

Aluminum conduit shall be used for all 400 Hz applications. No exposed conduit or piping shall be permitted on exterior of building surface.

Exterior disconnect switches shall be a maximum of 42” above grade. Set-screw connectors and couplings shall not be used.

3. No equipment grounding conductor shall be installed in empty or low control voltage conduits.

4. Low Voltage Dry Type Distribution

Transformers: All new low voltage dry type, copper wire distribution transformers 15 KVA and larger shall comply with NEMA TP-1 standards for energy efficiency.

5. Exit lights: All EXIT lights shall be of the high intensity L.E.D. type with the following standard features: die cast aluminum housing, canopy and faceplate with white powder coated finish; dual voltage (120/277V); polymeric diffuser; white face with 6” red high letters; single face of double face and directional arrows as required;

3 watts maximum (for either single or double face version). The emergency features shall include: maintenance-free nickel cadmium battery; automatic low-voltage disconnect;

reverse polarity and short-circuit protection;

AC indicator light; push-to-test switch; constant current charger. The nickel cadmium battery shall carry a minimum of a 5-year full warranty.

Exterior EXIT lights shall be vandal resistant.

6. Fluorescent Lamps: All 4’, T5 with matching rapid start electronic ballasts, rapid start fluorescent lamps, 28 watt. Also, compact fluorescents lights, LED shall be given consideration, in concurring with UFC 3530-01, and applicable Engineering Technical Letter

(ETL) as well for use in hallway lighting.

Fluorescent lamps shall be low mercury content.

7. Fluorescent Fixtures: Lighting for general office areas, classrooms, corridors, conference rooms, and lobbies shall be provided by 2’ x 4’ recessed fluorescent fixtures incorporating an aluminum parabolic louver with 27 cell, low iridescent, specular silver, parabolic louver.

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8. Emergency Lighting: Emergency lighting must be provided IAW the latest Edition NFPA 101.

Normally, emergency lighting is required only for designated stairs, aisles, corridors, ramps, escalator, and passageways leading to an exit.

Unit equipment must be circuited to comply with NEC. Do not use fixtures with wall-mounted battery packs. Emergency lights must be integral to installed fluorescent lighting or must be controlled by central battery backup system.

9. Lighting Levels: Design of interior illumination levels shall include evaluation of multi-level switching to provide user-adjustable levels of lighting, as well as dimming and work area lighting. Design Analysis shall address all options considered to minimize energy consumption while providing effective lighting, and document the reasons for choices made. Multi-level switching, using multiple ballasts and separately switched circuits to provide adjustable levels of lighting is the minimum standard for all facilities.

An example is having one tube on one ballast and two tubes on another ballast in a 2’x 4’ troffer so that one, two or three bulbs in a 3-bulb system can be selected. Another design tool is to provide additional switches to sectionalize the room in addition to level control. Other design considerations include task lighting, strategically placed down lights, dimmers, photoelectric controls, occupancy sensors, LED, solar lighting and day-lighting design, all of which give users flexible control of their workspace lighting and save money.

Lightning Protection

1. Lightning protection should be considered on all new facilities. Rods are preferred. Clamp-type connectors shall only be used for the connection of the roof conductor to the air terminal and to the guttering. All other connections, bonds, and splices shall be done by exothermic welds or by high compression fittings. Down conductors shall be protected by placing in PVC conduit for a minimum distance of 72 inches above finished grade level.

2. Provide proof of compliance with requirements of UL. The label of or listing in Underwriter

Laboratories (UL) Electrical Construction will be acceptable.

3. The final inspection report shall include:

a. Location of ground rods

b. The continuity test of grounding system

c. The resistance to ground is not excess of

25 ohms

d. Soil condition at the time of taking test.

Contracting Package

Responsible 27 SOCES engineers shall select which study (s) and drawing (s) to be done for each electrical project.

Design Analysis:

Minimum requirement are follows:

Short-circuit and fault calculations study.

Voltage (V) drop analysis study.

Load calculations for new and existing.

Coordination study, a minimum of two, coordinated ground fault level are required for 480V system, with electric service of

1000 Amp. And more.

Foot-candle analysis, calculation.

Drawings:

Minimum requirement are follows:

Electric site plan. Accurately scaled, showing:

All exterior electric from switch to pad-mounted transformer to electric service.\

All communication lines.

Wire and conduit sizes.

Reflected ceiling plan.

Lighting plan.

Power plan, panel schedule showing minimum 30% spare space.

Communication (Voice, data) plan with riser diagram.

Fire alarm plan with fire alarm riser diagram.

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Details showing grounding, trenching and backfilling, pad mounted transformers.

Poles including grounding, other details.

Electric power riser diagram, including wire and conduit sizes.

One line diagram, showing new, existing, the coordination and at least three fault points.

Load calculations and tabulations.

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